Pelvis

Question 1

Bones of the pelvis

Answer 1

• Pelvic bone
  > Ilium
  > Pubis
  > Ischium
• Sacrum
• Coccyx

Question 2

Male vs female bony pelvis (bone thickness, pubic arch/angle, acetabula, sacrum, coccyx)

Answer 2

• Bone thickness
  > M = heavier, thicker, more prominent markings
  > F = lighter, thinner, smoother
• Pubic arch/angle
  > M = 50-60°
  > F = 80-90°
• Acetabula
  > M = large, closer together
  > F = small, farther apart
• Sacrum
  > M = narrow, longer, sacral promontory more ventral
  > F = wider, shorter, sacral curvature is accentuated
• Coccyx
  > M = less movable, curves ventrally
  > F = more moveable, straighter

Question 3

Palpable landmarks of the pelvis

Answer 3

• Pubic tubercle
• Anterior superior iliac spine
• Iliac crest

Question 4

2 muscles of the lateral pelvic wall

Answer 4

• Obturator internus
• Piriformis

Question 5

What is the pelvic floor made of?

Answer 5

• Pelvic diaphragm
• Perineal membrane
• Muscles within deep perineal pouch

Question 6

Components of pelvic diaphragm

Answer 6

• Levator ani
  > Iliococcygeus muscle
  > Pubococcygeus muscle
  > Puborectalis muscle
• Coccygeus muscles (1 each side)